Why fall for misinformation? Role of information processing strategies, health consciousness, and overconfidence in health literacy

Health misinformation, defined as false or misleading claims lacking scientific evidence, poses a significant threat to public health. This paper investigates factors associated with the failure to discern misinformation, including health consciousness, information processing strategies, and inaccurate self-assessments of health literacy. Through an online experiment involving 707 English-speaking U.S. participants (mean age = 43 years, 56.2% female), we found that misinformation beliefs about nutrition, vaccination, vaping, and cancer were significantly correlated, implying susceptibility across health topics. Greater susceptibility was associated with higher health consciousness, lower objective health literacy, more elaboration, and more selective scanning. Results provided evidence for the Dunning-Kruger effect and metacognitive monitoring errors, whereby confident individuals were unaware of inadequate health literacy and showed poor misinformation identification. Findings suggest that promoting both health literacy education and cognitive reflection skills among the general adult population could empower them to more critically evaluate online health information.